I almost suspect you are from my parish!
Our bishop issued letters but it ended on the Pastor’s desk. We heard nothing!
Regardless, last year we gathered parishioners (about 20) to pray Rosaries in the Chapel for 9 weeks (Novena). We did ask for permission for using the Chapel 9 weeks for certain time. Some of the parishioners objected if we needed “permission” for prayer. However, like you said, it is very important to do things right under the authority of the Pastor.
But even the Pastor is liberal, there is a way. Just gather people by word of mouth. It does not have to be a large scale. We do as much as we can.